/*
 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.security.spec;

import java.math.BigInteger;

/**
 * This class represents the triplet (prime, exponent, and coefficient)
 * inside RSA's OtherPrimeInfo structure, as defined in the PKCS#1 v2.1.
 * The ASN.1 syntax of RSA's OtherPrimeInfo is as follows:
 *
 * <pre>
 * OtherPrimeInfo ::= SEQUENCE {
 *   prime INTEGER,
 *   exponent INTEGER,
 *   coefficient INTEGER
 *   }
 *
 * </pre>
 *
 * @author Valerie Peng
 * @see RSAPrivateCrtKeySpec
 * @see java.security.interfaces.RSAMultiPrimePrivateCrtKey
 * @since 1.4
 */

public class RSAOtherPrimeInfo {

  private BigInteger prime;
  private BigInteger primeExponent;
  private BigInteger crtCoefficient;


  /**
   * Creates a new {@code RSAOtherPrimeInfo}
   * given the prime, primeExponent, and
   * crtCoefficient as defined in PKCS#1.
   *
   * @param prime the prime factor of n.
   * @param primeExponent the exponent.
   * @param crtCoefficient the Chinese Remainder Theorem coefficient.
   * @throws NullPointerException if any of the parameters, i.e. {@code prime}, {@code
   * primeExponent}, {@code crtCoefficient}, is null.
   */
  public RSAOtherPrimeInfo(BigInteger prime,
      BigInteger primeExponent,
      BigInteger crtCoefficient) {
    if (prime == null) {
      throw new NullPointerException("the prime parameter must be " +
          "non-null");
    }
    if (primeExponent == null) {
      throw new NullPointerException("the primeExponent parameter " +
          "must be non-null");
    }
    if (crtCoefficient == null) {
      throw new NullPointerException("the crtCoefficient parameter " +
          "must be non-null");
    }
    this.prime = prime;
    this.primeExponent = primeExponent;
    this.crtCoefficient = crtCoefficient;
  }

  /**
   * Returns the prime.
   *
   * @return the prime.
   */
  public final BigInteger getPrime() {
    return this.prime;
  }

  /**
   * Returns the prime's exponent.
   *
   * @return the primeExponent.
   */
  public final BigInteger getExponent() {
    return this.primeExponent;
  }

  /**
   * Returns the prime's crtCoefficient.
   *
   * @return the crtCoefficient.
   */
  public final BigInteger getCrtCoefficient() {
    return this.crtCoefficient;
  }
}
